Tool arbor



FIG. 1 is a perspective view of a tool arbor embodying the invention.

FIG. 2 is a top view of the tool arbor shown in FIG. 1, the bottom view, left side view and right side view being substantially the same as the top view.

FIG. 3 is a front view of the tool arbor shown in FIG. 1; and,

FIG. 4 is a rear view of the tool arbor shown in FIG. 1.

The present application is directed to the shape and contour of the design illustrated in the drawings. 

The ornamental design for a tool arbor, as shown and described. 